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The emergence of network technologies and the appearance of new varied applications in terms of services and resources, have created new security problems for which existing solutions and mechanisms are inadequate, especially problems of identification and authentication. In a highly distributed and pervasive system, a uniform and centralized security management is not an option. It then becomes necessary to give more autonomy to security systems by providing them with mechanisms that allows a dynamic and flexible cooperation and collaboration between the actors in the system.
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